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Category: Gadgets and Appliances

I wanted a music workstation synthesizer and my wife wanted a real acoustic piano that looks like beautiful furniture. We compromised by getting the Yamaha Clavinova CLP-440. It looks, sounds and feels like a real piano with enough tech (MIDI, USB, voices) to make a armchair techy musician like me happy. The PDF documentation covers most of the details you will need to start using the nice features, but there are a few things lacking so I’ll record some of my discoveries in this post.

USB Files

The piano has a USB port that will easily accommodate a thumb drive or external hard drive. It stores and reads MIDI and WAV files.

Files created by the Clavinova will be stored in the “User Files” folder with a name USERSONG??.MID for MIDI files and USERAUDIO??.WAV for Audio files saved from the Clavinova. The ?? is the number of the song selected from the Clavinova LED interface. Here is an example listing of files on the USB drive:

USB Host with iPad

I wanted to be able to use my iPad to link to the piano for added voices and sequencing. There are several MIDI options available for the iPad, but since the CLP-440 has a USB host port, I was able to use an iPad camera kit (essentially an adapter to allow the iPad to view pictures from a SD card or USB camera). The Apple version and third party version should work fine. Using that, I found that several apps could see and control the CLP-440.

iPad Apps for the CLP-440

Searching the Apple iTunes store for app to work with the Clavinova wasn’t easy. I’ll record a few good apps that I found.

Midi Monitorhttp://iosmidi.com/apps/midi-monitor/ – This app shows the iPad connecting to the Clavinova and the events coming from the keyboard (as well as driving action back to the keyboard through the iPad interface). Useful for troubleshooting.

Alchemy mobile Synth Apphttp://www.camelaudio.com/AlchemyMobile.php – This great app from CamelAudio adds a great selection of synth voices to be controlled by the Clavinova. As their site says, “Turn your iPhone/iPad into a powerful synthesizer! Alchemy Mobile includes everything from evolving soundscapes and fat basses to lush pads and pulsing arpeggios, and is available for free from the iTunes App store.”

I wanted to put together a simple two LED flasher circuit that would use the fewest parts and low power. My first project of this type used the NE555 timer IC but besides the chip, it requires more power than what I would like to use. Using a couple low-power NPN transistors, the circuit should be able to run for hours on a 9v battery.

The Circuit

I decided to use two 2N3904 transistors (a low power NPN transistor). This design uses only 10 components but I added additional resistor to inline with the power source. It could be removed and the other resistors adjusted to lower the power.

I assembled the circuit using a low cost breadboard I picked up at Fry’s Electronics. Using a breadboard allowed me to play around with different components, especially the capacitors and resistors to tweak the flash rate and brightness.

Single LED Flasher

The simplest single LED Flasher circuit I have found uses a single transistor (NPN), 2 resistors and 1 capacitor. This circuit uses the transistor as a Negistor using the NDR (negative differential resistance) effect. The transitor will block current until the voltage threshold charging on C1 reach something close to 9v, at which point the voltage will become large enough to get the emitter-base junction to avelanche and drain the current through the LED.

On 6/20/09, we purchased a Samsung B630 40″ LCD TV. The B630 has an amazing picture. The 120Hz and high contrast features make this 1080p LCD monitor simply a delight. The unit comes with 4 HDMI inputs as well as two standard A/V inputs for game consoles (great for the kid’s Wii and Playstatation2). It also has a network port that pulls in news and weather feeds so you can hit an “info” button the remote and get semi-transparent overlay info boxes while watching your favorite show or movie. Yes, this is more of a gee-whiz feature than actually useful though we have used it to check the local weather–its accuracy hasn’t been very impressive.

The set has an audio optical out. I have this fed in to the Samsung DVD home theater system we purchased with the TV. As expected, the sound is great but activating it always generates a pause while the TV and receiver sync up. The set also has a USB port on the side that allows you to play media files (pictures, music and movies) from thumb drives and external hard drives. It is a fantastic feature and providing you have a good quality USB drive, it will stream beautiful full 1080p video.

HDMI Problems

Just over 2 months after buying the unit, our cable suddenly stopped working on our new Samsung B630 LCD TV. After some quick troubleshooting I discovered that it was only the HDMI-1 input that the cable box was using. The Samsung DVD Player on the 2nd HDMI port worked fine and the Cable would work when plugged in to any of the other inputs.

I notice another strange behavior. When the Cable and DVD cables were plugged in to HDMI-2 and HDMI-3, only one of the source inputs would work. If you select 2 or 3, you would still see the same thing (the Cable which was plugged in to HDMI-3). Moving things around to the other ports, I was able to do the same thing with the DVD. This mean that we were not able to use the 2nd or 3rd ports to have HD signal from both the Cable and DVD player. I eventually hooked up the component cables for the Cable box to the TV so that we could continue to view the up-conversion HD quality of our DVDs.

Samsung Support

The Sumsung website let’s you register and request repair for your Samsung products. Besides the Samsung LCD TV and Home Theater System, we purchased and registered our Samsung washer and dryer. The website can be very frustrating at times. It is slow and will frequently glitch. At one point, I encountered a page that had a huge listing of products, complete with their serial numbers and details from other customers. I didn’t drill in to see if it would present me with customer PII data, but clearly it shows that their web development team has work to do.

I did manage to report the HDMI problem via the website. It does require that you upload the original receipt. Unfortunately we had lost this (yes, not a good thing) but we had purchased this at Sears and the sears.com site will allow customers who used their Sears credit to view transaction receipts online. This allowed me to copy/paste into a Word document and upload that to the Samsung site. The site let us pick a date for the in-home repair and selected Monday. We received a call the next morning from the repair team. After getting the details of the problem, they moved the schedule to Tuesday and said they would bring the components that they felt would fix the HDMI problem.

Repair Visit #1

The in-home repair technicians arrived and brought the mainboard replacement. It looks like a small PC motherboard and is located in the lower left hand corner of the back of the TV, behind the connectors. I took a picture as the techs were installing the new motherboard.

After installing the new motherboard, the TV flashed a red error message at the top of the set. The tech attempted to reset the unit using various menu options (picture, firmware, etc.) but it would not clear. He said that the new mainboard was defective and he would need to order a new one. He re-installed the old mainboard.

Samsung B630 LCD TV Mainboard

After installing the old mainboard, the HMDI ports started working again! I asked what they did and he said that it looks like the mainboard has a faulty connector that caused the outage. He said that it does need to be replaced and they would order a new mainboard. Until then, the HDMI may or may not stay working. Hopefully it will keep working until they return for their second visit.

It is interesting that Samsung would not quality check their mainboards before sending them out in to the field. It seems to be a bit inefficient and if our old main-board had not mysteriously started working, it would be very frustrating for the customer. But I will say that the repair technicians were very good. They were friendly and quick.

Repair Visit #2

The technicians returned in two weeks to install the new mainboard. Thankfully the HDMI port did not go out again before the second visit.